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I know QL charge-to-velocity is not always accurate. No surprise with all the variables in guns and components.

I was looking at the QL calcs from the pressure-to-velocity correlations. That's how I use it nowadays. Then I ladder up over the chrono, stopping where chrono velocity correlates to the 60-62K pressure calc.

Anyway, sounds like you have tested results, where I'm just making conversation/speculation.

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Re: original ?, I think both are up to the task, when a good bullet is threaded thru vitals. Something not just any shooter can do, but many can learn w/practice, and an LRF, wind being your biggest hurdle perhaps.

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Well, I'd sneak a little closer.


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Originally Posted by MontanaMarine
I know QL charge-to-velocity is not always accurate. No surprise with all the variables in guns and components.

I was looking at the QL calcs from the pressure-to-velocity correlations. That's how I use it nowadays. Then I ladder up over the chrono, stopping where chrono velocity correlates to the 60-62K pressure calc.

Anyway, sounds like you have tested results, where I'm just making conversation/speculation.


Both of you always seem pretty solid.


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MontanaMarine,

That's generally how I use QL as well anymore, on the rare occasions I use it. I much prefer to use pressure-tested data, though!

In regards to the original question, the .270 will be capable of a little more muzzle velocity, which pretty much compensates for the difference in in BC out to 550.


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When working up loads for a 'wildcat' like 6.5-06, does one typically base pressure limits etc. on 'similar' cartridges with SAAMI specs? Such as the .25-06 or 270 Win in this instance?

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Originally Posted by Mule Deer
MontanaMarine,

That's generally how I use QL as well anymore, on the rare occasions I use it. I much prefer to use pressure-tested data, though!

In regards to the original question, the .270 will be capable of a little more muzzle velocity, which pretty much compensates for the difference in in BC out to 550.


Hence the reason I sold a bunch of wildcats and loaded 500+ rounds of the Hornady 140 BTSP over 58 grains of H4831 SC for my 270 and just called it good.

I wish I could shoot well enough that the difference at 500 yards would make a difference.....


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deadkenny,

That's apparently the way Nosler and Hodgdon worked their loads up.


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Another way to load for wildcats is to extrapolate from data for similar rounds. In this case, the .270 Winchester would be the easiest, since there's abundant data for 140-grain bullets.
The laws of internal ballistics suggest that the 6.5/06 is capable of about 97.5% of the velocity of the .270 with the same bullet weights.

Most .270 data doesn't list 140-grain loads that get 3000 fps in a 24" barrel. Most list a top velocity of just under 3000 fps. Barnes, however, lists several loads that top 3000, the fastest 3050 (IMR4831), which translates to 2974 for the 6.5-06.

One faster possibility, though, is Accurate MagPro--though their data doesn't include a 140-grain bullet. With a 130 it lists 3234 and with a 150 a flat 3000 fps, which means that a 140 should get around 3100. That would work out to around 3025 in the 6.5-06.


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The 6.5-06 and 6.5-284 are pretty much ballistic twins based on bore and case volume. Load data should be pretty close.

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In my 6.5-06, I am running RL22 and RL25 under 140 Berger vld bullets. On a wounded antelope buck at 530 yards laying prone and finishing it off before it made it under a fence, the berger did a perfect job and dropped it in its tracks. It was going to die from a buddies shot, just not fast enough.

On my doe at 498 yards, I dialed the cds and when she stopped to look back, the berger just slammed her down.

On my antelope buck at 220 yards, I clipped the back edge of the front shoulder, lost 2 pounds of meat and put him down in 5 yards.

On my mountain goat at 200 or so yards, it was dead right there with about half a front shoulder lost.

I cannot imagine telling a difference between the 270 or the 6.5-06 however I am completely sold on the speed and accuracy of the Leupold CDS system.

Got two more tags for plains deer in December and hope to have more results to post.

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Yeah, that's what I decided after doing an article on both rounds, chambered in otherwise identical E.R. Shaw rifles. Case capacity was the same, as near as I could measure it with water, and ballistics were just about identical with the same powder charges and bullets as well--though each rifle slightly preferred different bullets and powders.


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moosemuncher,

What sort of accuracy are you getting?



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Using the 140 Vlds, I got 8 rounds in .6" at 100. At 550 still holding very close to half moa. That out of a 6.25 pound rifle with a #2 hart off bipods. The buck at 530 I am very proud of as that was prone with no sling or bipod, just had time to range, dial and shoot.

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Excellent! Thanks for the info.


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Great stuff gents...thanks for taking me to school I appreciate it grin

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The 243 is a wonderous 550yd+ chambering.

550yds is pretty close in................


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Stick,

What are you loading in the 243 to reach out?


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105 A-Max.

Their .505BC is real,as are the terminal affects. Rather sumptin'................


Brad says: "Can't fault Rick for his pity letting you back on the fire... but pity it was and remains. Nothing more, nothing less. A sad little man in a sad little dream."
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Any other load and rifle data?

I'm looking for a long range deer load....


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